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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >A stochastic analysis based on a one-dimensional random walk model of the persistent phosphorescence of Mn2+ ions doped in zinc magnesium phosphate
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A stochastic analysis based on a one-dimensional random walk model of the persistent phosphorescence of Mn2+ ions doped in zinc magnesium phosphate

机译:基于磷酸镁掺杂掺杂Mn2 +离子持续磷光磷的一维随机步道模型的随机分析

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We investigate the mechanism of the persistent phosphorescence (PP) of beta-Zn-3(PO4)(2):Mn2+ and gamma-(Zn2+, Mg2+)(3)(PO4)(2):Mn2+ systems via stochastic analysis. An electron hopping mechanism, recombining electrons with Mn3+ ions, is proposed to elucidate the long-tailed decay feature that represents a non-exponential decay curve for the PP intensity change over time. A simulation using a one-dimensional random walk for the electron hopping in the host material successfully reproduces the PP decay curve. In the simulation, electrons, as charge carriers, are obliged to move on by a number of linearly ordered traps, to step forward or backward to the next trap with a probability of 1/2, and to keep hopping until reaching the emitting center. Furthermore, we present simulations of PP results depending on the temperature, Mn2+ ion concentration in beta-Zn-3(PO4)(2):Mn2+, and crystal lattice size in gamma-(Zn2+, Mg2+)(3)(PO4)(2): Mn2+. These results allow us to know that the length of the trap array can control the features of the PP time profile. Consequently, we conclude that a large number of patterns for electron hopping that recombine electrons with Mn3+ ions are responsible for the long-tailed PP decay curve.
机译:我们研究持续磷光的β-Zn类3(PO 4)的(PP)(2)的机制:MN2 +和γ-(Zn2 +的,Mg2 +的)(3)(PO 4)(2):通过随机分析MN2 +系统。电子跳跃机构,重组与MN3 +离子的电子,提出了阐明长尾衰减特性,它表示随时间的PP强度变化的非指数衰减曲线。使用用于电子在主体材料中的跳频的一维随机游走的模拟成功再现PP衰减曲线。在该模拟中,电子作为电荷载体,有义务由多个线性排列陷阱继续前进,与1/2的概率向前或向后步进到下一个陷阱,并且保持跳频直到达到发光中心。此外,根据不同的温度,在β-内的Zn-3(PO 4)MN2 +离子浓度(2)PP结果我们现在模拟:MN2 +,和晶格尺寸的γ-(Zn2 +的,Mg2 +的)(3)(PO 4)( 2):MN2 +。这些结果使我们知道陷阱阵列的长度可以控制PP时间曲线的特征。因此,我们得出结论,即大量的用于图案电子跳频重新结合的电子与MN3 +离子是负责长尾PP衰减曲线。

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